title: Validation of a new tool for automatic assessment of tremor frequency from video recordings.
abstract: We present a validation study for TremAn--a tool for automatic detection of tremor and measurement of its frequency from video recordings. To assess the validity of TremAn we designed a study consisting of tremor assessment from video, by accelerometry and by clinical evaluation using Fahn-Tolosa-Marin scale. 26 patients with essential tremor and 5 healthy volunteers underwent the examination in four standardized positions with focus on the hand tremor. Results showed that the frequencies of tremor measured with TremAn and with accelerometry are closely related, attaining agreement with less than 0.1 Hz difference in 80% and less than 0.5 Hz in 94% of measured samples. The reproducibility of frequency measurements using TremAn was comparable to the accelerometry, with the TremAn/accelerometry ratio of measurement error standard deviations equal to 0.99 (95% confidence interval (0.84, 1.17)).
authors.affiliation: Department of Cybernetics, Faculty of Electrical Engineering, Czech Technical University in Prague, Czech Republic.
authors.forename: Zdenka
authors.initials: Z
authors.lastname: Uhríková
authors.forename: Otakar
authors.initials: O
authors.lastname: Sprdlík
authors.forename: Martina
authors.initials: M
authors.lastname: Hoskovcová
authors.forename: Arnošt
authors.initials: A
authors.lastname: Komárek
authors.forename: Olga
authors.initials: O
authors.lastname: Ulmanová
authors.forename: Václav
authors.initials: V
authors.lastname: Hlaváč
authors.forename: Chris D
authors.initials: CD
authors.lastname: Nugent
authors.forename: Evžen
authors.initials: E
authors.lastname: Růžička
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D007839:Functional Laterality; D006801:Humans; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D012720:Severity of Illness Index; D013057:Spectrum Analysis; D014202:Tremor / Q000175:diagnosis* / Q000503:physiopathology*; D014741:Video Recording / Q000379:methods*; D055815:Young Adult